The boiler fires up when it should with the programmer, everything fine until programmer times out but electric is still going to room thermostat and boiler thermostat, electrician says not wiring but doesnt know why this should happen, any ideas??? we have changed 4 programmers and a valve and board.

BIG C, April 2012

ltd thanks - not sure think it is a full system boiler. think electrician used Y plan if that helps. do you think it is definitely the wiring then?

BIG C, April 2012

Is it system boiler ? Than boiler manual has wiring diagram if you follow what system you have two motorize valve,two port valve it's all in boiler manual and wire according

ltd, April 2012